EP1465738A1 - Procede et appareil de couchage des deux cotes d'une feuille - Google Patents

Procede et appareil de couchage des deux cotes d'une feuille

Info

Publication number
EP1465738A1
EP1465738A1 EP02764905A EP02764905A EP1465738A1 EP 1465738 A1 EP1465738 A1 EP 1465738A1 EP 02764905 A EP02764905 A EP 02764905A EP 02764905 A EP02764905 A EP 02764905A EP 1465738 A1 EP1465738 A1 EP 1465738A1
Authority
EP
European Patent Office
Prior art keywords
web
coating
coating slip
slip
travel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02764905A
Other languages
German (de)
English (en)
Other versions
EP1465738B1 (fr
Inventor
Pauli Kytönen
Seppo Luomi
Petri Paloviita
Pentti Rautiainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1465738A1 publication Critical patent/EP1465738A1/fr
Application granted granted Critical
Publication of EP1465738B1 publication Critical patent/EP1465738B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D21H23/72—Plural serial stages only

Definitions

  • the invention concerns a method for two-sided coating of a moving paper or board web.
  • the invention also concerns equipment for coating a moving paper or board web and including devices for applying a coating slip to a first surface of the web, devices for applying a coating slip to a second surface of the web as well as devices for drying the web, which has been coated on both sides.
  • curtain coating In curtain coating, the coating slip is applied to the surface of the moving paper or board web from a nozzle gap located above the web transversely to the web's direction of travel, from which gap the coating slip falls on to the web surface as a curtain-like shower.
  • Curtain coating is a contact-free coating method, wherein after the spreading of the coating slip no force is applied to the paper web in order to control the quantity of coating remaining on the web surface. For this reason, there are less breaks caused by breaking of the paper web and runnability is better than, for example, in the blade-coating method. With curtain coating a better coverage is achieved than with blade coating, but the smoothness of the coated sur- face is not so good.
  • the curtain-coating beam Since the method utilises gravity, the curtain-coating beam must always be located above the web to be coated. This makes it impossible to coat both sides of the paper or board web at the same time.
  • a normal procedure in one-sided coating is first to coat the first side of the web, dry the web completely, turn it upside down, coat the second side and dry the coated web once again. This requires long web transfers between two coating points as well as two complete sets of drying equipment.
  • the invention aims at allowing two-sided coating of paper when using a gravity- based method for application of the coating slip.
  • the method according to the invention is characterised by the features pre- sented in the characterising part of claim 1.
  • the equipment according to the invention is characterised by the features presented in the characterising part of claim 6.
  • the coating method according to the invention includes steps, wherein a) a coating slip is applied to the first surface of the web using a gravity-based method for application of the coating slip, b) the web's direction of travel is turned through 120 - 200°, c) the coating slip is applied to the second surface of the web using a gravity- based method for application of the coating slip, and d) both sides of the web are dried.
  • the web's direction of travel may be turned once again in the step where both sides of the web have been coated.
  • a turning roll or contact-free turning device is used as the turning equipment.
  • the web may also be dried without contact in con- nection with the turning equipment.
  • the gravity-based method for application of the coating slip may be curtain coating, coating of the MicroJet type, which is described in patent application FI 991498, or some other coating method working essentially in such a way that the application equipment must be located above the web.
  • MicroJet coating the coating slip is directed through holes in the nozzle plate towards the surface of the moving web.
  • One-sided coating can typically be performed on both sides of the web without any complete drying in between and without long transfers. Savings result due, among other things, to the fact that only one piece of drying equipment is needed and the coating machine is essentially shorter. Threading is short and free draws of the web are short, which improves the runnability of the machine.
  • Figure 1 shows the layout of state-of-the-art coating equipment, wherein one side at a time is coated.
  • Figure 2 shows the layout of two-sided curtain-coating equipment according to the invention.
  • Figure 3 shows curtain-coating equipment for two-sided coating of the web.
  • Figure 4 shows curtain-coating equipment, wherein the web is dried while it is being turned around.
  • Figure 5 shows an alternative layout of the equipment according to the invention.
  • the following is a study of the traditional way of performing coating of the web from one side at a time using curtain coating.
  • a layout of a similar type is used e.g. in blade coating, which typically is a one-sided coating method.
  • the paper web W is guided to travel under a first curtain- coating beam 11 , from which an even layer of coating slip is applied to the upper surface S A of the moving web W as a freely falling curtain.
  • the coated side S A of the web is first dried without contact by infra-drying equipment 12 and then both sides of the web are dried without contact by air-drying equipment 13.
  • the drying is finished as contact drying using steam-drying cylinders 14.
  • the web W is then transported guided by guiding rolls 15 over a relatively long distance to turn it the other way round, in order to allow coating of the other side S B of the web.
  • a second curtain-coating beam 16 is located, which is followed by infra-drying equipment 17 to dry the coated surface S B - Following then are air-drying equipment 18 and drying cylinders 19 for two-side drying of the web.
  • the coated web W is moved further guided by guiding rolls 20 to a reel-up 21.
  • Figure 2 illustrates how much the length of the coating machine is reduced by the way according to the invention of coating both sides of the web almost simultaneously. Partly the same reference numbers as in Figure 1 are used for parts corresponding to each other.
  • a coating slip is applied using a first curtain-coating beam 11 , and the coated side is dried without contact using infra-drying equipment 12. Then the travelling direction of the web W is changed with the aid of two successive turning rolls 22 so much that after the change of direction the web will travel obliquely downwards towards the incoming direction of the web W.
  • a layer of coating slip is applied to the second surface S B of web W by a second curtain-coating beam 16, which is fitted above the web W on its run travelling obliquely downwards.
  • the web's direction of travel is again changed with the aid of two contact- free turning devices 23 and 24, whereby in the area remaining in between these devices the web's surface S B , which was coated last, is dried by infra-drying equipment 17. Then the completely coated web W is dried with the aid of air-drying equipment 13 and steam-drying cylinders 14.
  • Figure 3 shows the principle of the curtain-coating equipment according to the invention, wherein the direction of travel of the web W to be coated is from above left down to the right and wherein the web's W direction of travel is turned around twice.
  • a first curtain-coating beam 11 Above the first run of the web a first curtain-coating beam 11 is located, from which a layer of coating slip is dropped as a uniform curtain on to the first surface S A of web W.
  • the web's W direction of travel is changed with the aid of one or more turning rolls 22 by 120 - 200° in such a way that after the turning roll 22 the web W will travel obliquely downwards towards its incoming direction.
  • a second curtain-coating beam 16 is located above the web W and from this beam a layer of coating slip falls as a uniform curtain on to the second surface S B of web W.
  • the direction of travel of the web W which has now been coated on both sides, is changed for a second time with the aid of a contact- free turning device 23 in such a way that the web W will once again travel in its original direction.
  • the turning device 23 may be e.g. a TurnFloat turning device made by the applicant, wherein an air flow is blown against the web's W coated surface S A -
  • an air cushion is formed between the web W and the turning device 23 to keep the moist and coated web W separate from the surface of the turning device 23.
  • Figure 4 shows a solution, wherein the web's W coated surfaces S A , S B are dried without contact in connection with the change in the direction of travel of the web.
  • an air impingement drier 25 After the second curtain- coating beam 16 both surfaces S A , S B of the web are wet, for which reason it is advantageous for the turning to use a turning-and-drying device 26 drying the web without contact on both sides, which device 26 is e.g. the turning-and-drying device made by the applicant under the product name TurnDry.
  • Figure 5 shows a solution, wherein after the first curtain-coating beam 11 a first turning device 27 is used to turn the web W upwards to travel obliquely upwards towards the web's W incoming direction. At this section a second curtain-coating beam 16 is located above the web, whereupon the web's W direction of travel is changed with the aid of a second turning device 28 in such a way that it will once again travel in its original outgoing direction.
  • curtain-coating beam there may be some other gravity-based coating device, such as, for example, a MicroJet beam, which is located above the web and where the coating is brought to the web from a distribution chamber through a sieve in the form of small jets, which merge on the web forming a coherent coating surface.
  • a MicroJet beam which is located above the web and where the coating is brought to the web from a distribution chamber through a sieve in the form of small jets, which merge on the web forming a coherent coating surface.
  • Figures 2 - 5 show such a form of application only, wherein the web's direction of travel is turned twice by 120 -200°, it is possible to embody the invention also in such a way that the web's direction of travel is changed only once.
  • the claims are presented, which define the inventive idea, within the scope of which the various details of the invention may vary and differ from the above presentation, which was given by way of example only.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé et un équipement de couchage des deux côtés d'une feuille de papier ou d'un carton en déplacement (W). A cet effet, on applique une sauce de couchage sur une première surface (SA) de la feuille à l'aide d'un procédé s'inspirant de la gravité et consistant à appliquer la sauce de couchage, le sens de défilement de la feuille (W) est dévié de 120 à 200°, puis on applique la sauce de couchage sur une seconde surface (SB) de la feuille au moyen d'un procédé s'inspirant de la gravité consistant à appliquer la sauce de couchage, puis les deux côtés (SA, SB) de la feuille sont séchés. Les dispositifs utilisés pour l'application de la sauce de couchage sur les surfaces (SA) de la feuille comprennent deux modules d'application (11, 16) placés au-dessus de la feuille et présentant un espace de distribution ou des orifices de distribution permettant d'y verser la sauce de couchage conformément aux lois de la gravité sur la surface à coucher. Au cours du défilement de la feuille (W) restant entre les modules d'application (11, 16), des dispositifs de rotation (22) permettent de modifier le sens de défilement de la feuille de 120 à 200° après application de la sauce de couchage sur la première surface (SA) de la feuille.
EP02764905A 2001-10-08 2002-10-03 Procede et appareil de couchage des deux cotes d'une feuille Expired - Lifetime EP1465738B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20011953 2001-10-08
FI20011953A FI20011953A0 (fi) 2001-10-08 2001-10-08 Menetelmä ja laitteisto liikkuvan rainan päällystämiseksi
PCT/FI2002/000778 WO2003031080A1 (fr) 2001-10-08 2002-10-03 Procede et appareil de couchage des deux cotes d'une feuille

Publications (2)

Publication Number Publication Date
EP1465738A1 true EP1465738A1 (fr) 2004-10-13
EP1465738B1 EP1465738B1 (fr) 2008-11-26

Family

ID=8562013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02764905A Expired - Lifetime EP1465738B1 (fr) 2001-10-08 2002-10-03 Procede et appareil de couchage des deux cotes d'une feuille

Country Status (8)

Country Link
US (1) US20050008785A1 (fr)
EP (1) EP1465738B1 (fr)
JP (1) JP2005504898A (fr)
AT (1) ATE415207T1 (fr)
CA (1) CA2463160C (fr)
DE (1) DE60230063D1 (fr)
FI (1) FI20011953A0 (fr)
WO (1) WO2003031080A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7563326B2 (en) 2002-06-24 2009-07-21 Voith Paper Patent Gmbh Device for coating and drying both sides of a material web of paper or board
DE10228114A1 (de) * 2002-06-24 2004-01-15 Voith Paper Patent Gmbh Vorrichtung zum beidseitigen Streichen und zum Trocknen einer Materialbahn, insbesondere aus Papier oder Karton
DE10349122A1 (de) * 2003-10-22 2005-05-25 Voith Paper Patent Gmbh Maschine zum Auftragen eines flüssigen oder pastösen Auftragsmediums auf die beiden Oberflächen einer laufenden Materialbahn
JP2005161152A (ja) * 2003-12-01 2005-06-23 Voith Paper Patent Gmbh 塗工装置
DE102004045172A1 (de) * 2004-09-17 2006-03-23 Basf Ag Verfahren zur Herstellung von ein- oder mehrfach gestrichenen Substraten mit einer ein Bindemittel vor Haftung umfassenden Streichfarbenzusammensetzung
US20090321001A1 (en) * 2008-06-26 2009-12-31 Seaman Corporation One-pass direct double lamination apparatus and process
JP6736247B2 (ja) * 2013-03-28 2020-08-05 日本製紙株式会社 塗工白板紙およびその製造方法
KR101430253B1 (ko) 2014-05-08 2014-09-23 (주)하나 스플릿레더의 양면 코팅방법 및 이를 위한 코팅장치
CN107159525B (zh) * 2017-07-11 2019-02-19 广东华丽宝实业有限公司 一种保护膜生产线用双面涂布收卷装置
CN109692787A (zh) * 2019-02-26 2019-04-30 浙江瑞旭汽车零部件有限公司 滤材双面施胶装置
CN110644285A (zh) * 2019-09-19 2020-01-03 上海影佳实业发展有限公司 一种纸张表面涂覆聚乙烯醇装置
KR102403955B1 (ko) * 2021-02-04 2022-06-03 박한수 웹종이 코팅장치
KR102358580B1 (ko) * 2021-10-08 2022-02-09 에이치비페이퍼 주식회사 웹종이 코팅장치
KR102382849B1 (ko) * 2021-10-08 2022-04-11 에이치비페이퍼 주식회사 웹종이 코팅장치

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GB1295536A (fr) * 1970-04-03 1972-11-08
JPS6057385B2 (ja) * 1977-03-22 1985-12-14 富士写真フイルム株式会社 両面塗布方法
US4209584A (en) * 1979-06-15 1980-06-24 Eastman Kodak Company Manufacture of photographic elements having anticurl and antistatic layers
US5136966A (en) * 1988-10-28 1992-08-11 Konica Corporation Web coating apparatus
JPH02293072A (ja) 1989-05-01 1990-12-04 Fuji Photo Film Co Ltd 両面塗布方法
DE4416399C2 (de) * 1994-05-09 1999-04-01 Voith Gmbh J M Trocknungsvorrichtung für eine laufende Materialbahn
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FI108993B (fi) 1999-06-30 2002-05-15 Metso Paper Inc Menetelmä ja sovitelma käsittelyaineen levittämiseksi liikkuvalle pinnalle

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Also Published As

Publication number Publication date
US20050008785A1 (en) 2005-01-13
WO2003031080A1 (fr) 2003-04-17
DE60230063D1 (de) 2009-01-08
EP1465738B1 (fr) 2008-11-26
ATE415207T1 (de) 2008-12-15
CA2463160A1 (fr) 2003-04-17
FI20011953A0 (fi) 2001-10-08
JP2005504898A (ja) 2005-02-17
CA2463160C (fr) 2009-06-30

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